I have been pointed in this direction for troubleshooting. I have a .edu I just setup with Cloudflare that has been propagating for over four days. As a .edu my nameservers are pointing from Educause (government regulated domain registrar). When I setup the Cloudflare account, I updated the nameservers as instructed. I mentioned the issue to Squarespace and they said all the information was entered into the DNS at Cloudflare correctly. So it is out of Squarespace’s hands.
Has anyone else had this issue? Might there be something that need to be deleted?